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Transfer of Good or Service [Axis] Schedule of Restrictions on Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Intangible assets Intangible Assets Disclosure [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Debt Debt Disclosure [Text Block] Franchise revenues Franchise [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Principal amount of debt Debt Instrument, Face Amount Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Franchise Fees Receivable Franchise Fees Receivable [Text Block] Franchise Fees Receivable Entity Address, Postal Zip Code Entity Address, Postal Zip Code Basis of Combination Consolidation, Policy [Policy Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Common stock Common Stock, Value, Issued Greater than 3.50 Threshold Four [Member] Threshold Four [Member] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Interest income Interest Income Interest Income1 [Member] Interest Income1 Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Charges to bad debts Financing Receivable, Credit Loss, Expense (Reversal) Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Issuance of notes receivable to franchisees Payments to Acquire Notes Receivable Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Debt Covenant [Domain] Debt Covenant [Domain] Debt Covenant [Domain] Non-controlling interest Noncontrolling Interest Disclosure [Text Block] Basic (in dollars per share) Earnings per share of Class A common stock - basic (in dollars per share) Earnings Per Share, Basic Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Receivable from franchisees Increase (Decrease) In Accounts Receivable - Franchise Receivable Increase (Decrease) In Accounts Receivable - Franchise Receivable Proceeds from notes receivable to franchisees Proceeds from Sale and Collection of Notes Receivable Ownership [Domain] Ownership [Domain] Liabilities under the tax receivable agreement, current Liabilities Under Tax Receivable Agreements, Current Liabilities Under Tax Receivable Agreements, Current Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Dividends Payable [Line Items] Dividends Payable [Line Items] Net income attributable to GSHD - Basic Net Income (Loss) Available to Common Stockholders, Basic LLC Units LLC Units [Member] LLC Units [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] As Previously Reported Previously Reported [Member] Total assets Assets Revolver balance Long-Term Line of Credit Franchise license revenue period Franchise License Term Franchise License Term Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Termination Date Trading Arrangement Termination Date Schedule of Interest Rate Dependent of Leverage Ratio Schedule Of Interest Rate Dependent Of Leverage Ratio [Table Text Block] Schedule Of Interest Rate Dependent Of Leverage Ratio [Table Text Block] Revenues Revenues Notes Payable to Bank Notes Payable to Banks [Member] 2026 Long-Term Debt, Maturity, Year One Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Entity Address, City or Town Entity Address, City or Town Debt Instrument [Axis] Debt Instrument [Axis] Noncontrolling Interest [Abstract] Dividends [Axis] Dividends [Axis] Equity-based compensation expense Share-Based Payment Arrangement, Expense Net income attributable to Goosehead Insurance, Inc. Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Schedule of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Revenue Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Noncontrolling interest Noncontrolling Interest [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Impacts of tax receivable agreement Increase (Decrease) in Due to Related Parties Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Number of office locations Number Of Office Leases Number Of Office Leases Name Forgone Recovery, Individual Name Phone system Phone System [Member] Phone System [Member] Document Period End Date Document Period End Date Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Premiums payable Premiums Payable, Current Premiums Payable, Current Insider Trading Arrangements [Line Items] EBITDA ratio Debt Instrument, Earnings Ratio Debt Instrument, Earnings Ratio Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Renewal Royalty Fees Renewal Royalty Fees [Member] Renewal Royalty Fees PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Revenue recognized during the period Contract with Customer, Liability, Revenue Recognized Adjustment to Compensation: Adjustment to Compensation [Axis] Less: net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Entity Current Reporting Status Entity Current Reporting Status Accumulated deficit Retained Earnings [Member] Ownership interest held by non-controlling interest holders Subsidiary, Ownership Percentage, Noncontrolling Owner Proceeds from the issuance of Class A common stock Proceeds from Issuance Initial Public Offering Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Basic (in shares) Weighted average outstanding Class A common shares - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Capitalized software development costs Payments for Software Document Information [Table] Document Information [Table] Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Less: net income attributable to noncontrolling interests Income (Loss) Before Income Taxes, Attributable To Noncontrolling Interest Income (Loss) Before Income Taxes, Attributable To Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Contingent Commissions Contingent Commissions [Member] Contingent Commissions Entity Filer Category Entity Filer Category Company Selected Measure Name Company Selected Measure Name